Radiation-Curable Gel Ink Gloss Stability via Low MW Polyalkylene Wax
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Solution Overview
Problem
Radiation-curable gel ink compositions face challenges in maintaining a stable gloss level on prints due to temperature variations of the recording medium, as the gelling process is complex and difficult to control, leading to unwanted changes in the gloss level of printed images.
Innovation Solution
A radiation-curable ink composition comprising at least 55 wt% radiation-curable components and a polyalkylene wax with a molecular weight of 1000 g/mole or less, along with a gelling agent, to stabilize the gloss level and prevent color bleeding, while using a method that involves mixing these components and applying the ink composition onto a recording medium followed by UV curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a gelling agent is used to provide gelling property in radiation-curable gel ink compositions, then droplet spreading is decreased and color bleeding is prevented, but the gloss level becomes unstable and changes with recording medium temperature
Solution Approach 1:
The invention changes the molecular weight parameter of the polyalkylene wax to 1000 g/mole or less, which fundamentally alters the gelling behavior and microstructure formation. This parameter change enables stable gloss levels across different temperatures by controlling the gelation process more predictably
Solution Approach 2:
The invention uses a composite system combining radiation-curable components (at least 55 wt%) with low molecular weight polyalkylene wax (molecular weight ≤1000 g/mole) as the gelling agent. This composite approach creates a more stable microstructure that maintains consistent gloss properties under varying temperature conditions
2Adaptability or versatility
If the temperature of the recording medium is not controlled during printing, then printing process flexibility is improved, but the gloss level of prints changes due to temperature variations
Solution Approach 1:
The low molecular weight polyalkylene wax acts as a buffer that anticipates and compensates for temperature variations during printing. By pre-establishing a stable microstructure through controlled gelation, the system cushions against gloss level changes even when recording medium temperature varies
Solution Approach 2:
Changing the molecular weight parameter of the polyalkylene wax to ≤1000 g/mole fundamentally improves the system's adaptability to temperature variations, allowing stable gloss levels without requiring controlled printing conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ink composition achieves a higher gloss level and stable image quality by controlling droplet spreading and preventing blooming, ensuring consistent print quality even with varying recording medium temperatures.
Implementation Method 1
Radiation-curable ink compositions comprise one or more radiation curable components... radiation curable monomers and/or radiation-curable oligomers... (meth)acrylates, epoxides, vinyls... that may react (e.g. polymerize) under influence of suitable radiation, such as electromagnetic radiation, e.g. ultraviolet (UV) radiation
Implementation Method 2
Radiation curable gel ink compositions typically comprise a gelling agent. The gelling agent provides the ink composition with gelling property... The gelling process is a complex process. The gelling process may influence the microstructure of the ink layer
Data Source
AI summary
The present invention relates to a radiation-curable ink composition. The present invention further relates to a method for preparing a radiation-curable ink composition. In addition, the present invention relates to a method for applying an image onto a recording medium.